Hardware Friendly Oriented Design for Alternative Transform in HEVC

Hardware implementation for video coding is gathering more and more focus these days. For intra prediction, the new emerging secondary directional transform is applied after DCT/ICT in the video coding to exploit the potential energy compaction. In this paper, we propose a hardware friendly orientated design flow based on simple difference function which can achieve similar performance as original transform but substitute all low efficient multiplication operations by regular shifting and addition. Especially for the current secondary transform which is rotational transform (ROT), we obtain the hardware friendly ROT (HF_ROT) through our method. Based on the analysis, the proposed method can achieve massive operation reduction if properly design and regular data flow and simple control signal. Simulation results of hardware friendly ROT show that our proposed method can achieve similar performance as the original transform and importantly it is hardware friendly, largely lifting the hardware implemented efficiency. What is more, our proposed method can be applied to other matrix related coding methods.